Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/f3866edf8d3e
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #13923 from mikehenrty/bug-941364-wait

Bug 941364 - make browser wait for tab to close when testing net_error.h... r=lightsofapollo

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https://hg.mozilla.org/integration/gaia-central/rev/8f58a09601d6
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 941364 - make browser wait for tab to close when testing net_error.html